#!/usr/bin/env python
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from rostest import rostestmain

import os
import sys
import tempfile


class PythonPathOverride:
    """Replace python so test scripts with unmodified shebangs use correct Python version."""

    def _skip(self):
        # skip this hack on windows
        if 'nt' == os.name:
            return True
        try:
            # skip pre Python 3.2
            tempfile.TemporaryDirectory
        except AttributeError:
            return True
        return False

    def __enter__(self):
        if self._skip():
            return

        self.dir = tempfile.TemporaryDirectory(prefix='rostest_bin_hook')
        os.symlink(sys.executable, os.path.join(self.dir.name, 'python'))
        os.environ['PATH'] = self.dir.name + os.pathsep + os.environ['PATH']

    def __exit__(self, t, v, tb):
        if self._skip():
            return

        self.dir.cleanup()


with PythonPathOverride():
    rostestmain()
